undeˈclarable,a. (un-1 7 b and 5 b.) c1449Pecock Repr. ii. xvi. 245 Of the spirit and of the ymage to gidere in an vndeclarable maner schulde be maad a sensible God.1675Penn Summons to ChristendomWks. 1782 III. 319 Oh the peace, the joy, the pleasure and the undeclarable comfort!